We replace the gasket due to a leak of coolant or engine oil at the junction of the block head with the cylinder block.
To replace the cylinder head gasket, the engine must be removed, as the timing chain must be removed.
Access to the gas distribution mechanism on the engine installed on the car is not possible.
To do the job, you will need tools: heads for 8,10, 15, 16, a torque wrench, an extension cord, a wrench, a set of screwdrivers, a set of flat feelers, a metal ruler, a stopper for fixing the pulley.
Preparing the car for work.
Removing the engine.
Remove the gas recirculation valve assembly with the heat exchanger.
Remove the turbocharger.
Remove the head cover (article - Replacing Cummins ISF2.8 cylinder head cover gasket).
Setting the piston of the first cylinder to TDC of the compression stroke Setting the TDC of the first cylinder Cummins ISF2.8.
We unscrew the five bolts securing the crankcase cover of the gas distribution drive
Remove the cover
Remove the gasket. When installing, you need to replace the gasket
We unscrew the two bolts securing the cover of the hydraulic chain tensioner
Remove the cover
Remove the hydraulic tensioner plunger
We fix the chain by tying it with wire
Weaken the bolt securing the drive disk and the camshaft sprocket, keeping the shaft from turning.
We completely unscrew the bolt securing the drive disk of the phase sensor and the camshaft sprocket
After unscrewing the bolt securing the timing sensor drive disk and the camshaft sprocket, the crankshaft and camshaft must not be rotated so as not to disturb the valve timing.
Removing the disc
Remove the sprocket and chain from the camshaft shank
Remove the spacer so as not to lose it
Fix the timing chain with the sprocket on the engine
Remove the thermostat housing
Loosen the bolt securing the damper of the timing chain drive to the head of the block
And unscrew the bolt.
We unscrew the two bolts securing the timing gear housing to the flywheel housing
The location of the bolts fastening the crankcase of the timing drive
We unscrew the bolts of fastening of all rocker arms
Removing the bolts
Remove the rocker
Remove the supports of the rocker axles
We unscrew the ten bolts of the cylinder block
The location of the cylinder head bolts in Figure 27
We untie the camshaft sprocket with the chain from the block head and remove the head with the intake pipe, exhaust manifold and vacuum pump, keeping the timing chain taut.
After removing the cylinder head, we immediately fix the gas distribution drive chain separating the wire in a taut state so that it does not fall off the crankshaft sprocket.
Remove the cylinder head gasket
We inspect the mating surfaces of the head and cylinder block.
We clean the mating surfaces from the remnants of the old gasket.
Check the cylinder head for warping.
We place a ruler with an edge on the surface of the head, first in the middle along, then diagonally, and in all positions of the ruler we measure the gap between the surface of the head and the ruler with a probe.
If the gap is greater than 0.05 mm, replace the head.
We remove the new gasket from the package immediately before installation.
We install a new gasket on the cylinder block with a sealing roller applied to the gasket up.
Install the cylinder head in reverse order, taking into account:
- - remove oil or coolant from the threaded holes for the cylinder head bolts that got there after removing the head;
- - lubricate the bolts with engine oil;
- - we screw in the cylinder head mounting bolts and two bolts for fastening the gas distribution drive housing by hand, but without tightening it;
- - tighten the bolts on a cold engine in the order shown in the figure ...
- The first stage - we tighten the bolts with a torque of 60 Nm;
- The second stage - we screw in the mounting bolts by 90˚;
- Third step - tighten the mounting bolts 90˚.
Tighten the two bolts securing the timing gear housing to a torque of 4 Nm.
Install all parts in reverse order.
Install the engine on the car.